Michaelvk Posted March 12, 2012 Share Posted March 12, 2012 Whoah, wait.. Hang on a mo.. ARE THOSE PISTONS???? Link to comment Share on other sites More sharing options...
TerryUK Posted March 13, 2012 Share Posted March 13, 2012 I have been following this impressive build. Iain, I thought you might like to read about Yanks Air Museum`s EC-121 Super Constellation Flight the link is here: https://yanksair.com/ynarticles/detail/Yank...nnie-Flight/74/ In case you missed it. Regards Terry Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 13, 2012 Author Share Posted March 13, 2012 Whoah, wait.. Hang on a mo.. ARE THOSE PISTONS???? Yup - can't claim credit there - that's Zoukei-Mura. Personally I think it's overkill!! Iain I have been following this impressive build. Iain, I thought you might like to read about Yanks Air Museum`s EC-121 Super Constellation Flight the link is here: https://yanksair.com/ynarticles/detail/Yank...nnie-Flight/74/ In case you missed it. Regards Terry Cheers Terry - hadn't seen that! Iain Link to comment Share on other sites More sharing options...
christof Posted March 13, 2012 Share Posted March 13, 2012 Great work on this so far Iain. Keep looking for this topic when I'm on here. Christof Link to comment Share on other sites More sharing options...
dergrunepunkt Posted March 13, 2012 Share Posted March 13, 2012 it's a shame you had problems with your moulds, that happened to me once, another think that went wrong making moulds was to use old rubber, the effect of that was the rubber tightly adhered to the peace, be careful with that, look forward for more progress Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 15, 2012 Author Share Posted March 15, 2012 Fortunately the rubber has finally gone off! So - plasticene removed from the engine block/cylinder mould and minor tweaks made in preparation for pouring the second half of the mould. As the gearbox casing mould was single part I thought I'd do a quick pour - result below - almost flawless copy Iain Link to comment Share on other sites More sharing options...
Radleigh Posted March 16, 2012 Share Posted March 16, 2012 Looks great Iain 1 Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 17, 2012 Author Share Posted March 17, 2012 (edited) Planned fly out to Bruntingthorpe to see the Lightnings/Cold War Jets canceled due to weather - so spare day to fettle stuff! So - in further moulding progress we now have all four gearbox casings: And second part of the engine block/cylinder mould prepped and poured (those white tubes will form the pour stubs when casting): Those are rising air bubbles - all should have dissipated by time rubber cures... Right - off to do some Lightning stuff Iain Edited March 17, 2012 by Iain (32SIG) Link to comment Share on other sites More sharing options...
turnerdad Posted March 17, 2012 Share Posted March 17, 2012 Nice bit of casting there Iain keep going, this is going to be rather special, I expect to see it in the flesh one day! Link to comment Share on other sites More sharing options...
AnonymousAA74 Posted March 17, 2012 Share Posted March 17, 2012 Nice work Iain. The pistons in the engines do help with the orientation of the parts in relation to the exhaust stub system on the Skyraider, but other than that, nope they won't be seen. Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 18, 2012 Author Share Posted March 18, 2012 Cheers guys! I expect to see it in the flesh one day! Erm - so do I!! Well - in a repeat of last weeks panic over slow curing rubber it looks like it's repeated itself - rubber still not gone off properly! At least it finally cured last week - so there's hope that more patience will pay off (was hoping to cast some engines this afternoon) - but suspect my rubber's a bit past it! Iain Link to comment Share on other sites More sharing options...
Alan P Posted March 18, 2012 Share Posted March 18, 2012 - but suspect my rubber's a bit past it! Pssst! Iain! While no-one's listening - you're not actually supposed to re-use them.... Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 18, 2012 Author Share Posted March 18, 2012 Bu**er - I knew I must be doing something wrong! Iain Link to comment Share on other sites More sharing options...
bigbadbadge Posted March 18, 2012 Share Posted March 18, 2012 Wowee, just caught up with this very impressive build, what fantastic work Iain. You must have a large house !!! All the best Chris Link to comment Share on other sites More sharing options...
Julien Posted March 18, 2012 Share Posted March 18, 2012 Looking good, keep up the hard work Julien Link to comment Share on other sites More sharing options...
shark 64 Posted March 19, 2012 Share Posted March 19, 2012 Impressive work as usual, Nice work Oliver Link to comment Share on other sites More sharing options...
ursa_major Posted March 19, 2012 Share Posted March 19, 2012 Iain, which of Sylmasta's rubbers are you using? I've used both the 370 & 380 grades so far and not had any problems with it curing (only user error where I did the rubber pour and only realised I'd not actually fixed the masters to the bottom of the casting box when I tried de-moulding them). Yours look a bit on the light side colour-wise, do you add your catalyst by volume or weight? I've been weighing mine in and (as a pleasant surprise) it's cured perfectly each time, generally closer to 20 hours than 24. I do wish they'd supply slightly more than the exact accurate amount of catalyst though, I always seem to end up with a tiny amount that won't come out of the plastic pipettes. G. Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 19, 2012 Author Share Posted March 19, 2012 Hiya - it's the 380... Am running at 5% catalyst by volume (to be fair - it does say by weight!) and had no probs before. The colour is darker blue than appears in the photos... Rubber was bought at Telford in 2010 though - so not the freshest! Anyhoo - it went off - and I've separated everything tonight. Unfortunately not enough mould release so the rummer bonded itself together in places. Did a quick test shot and have the basics of something useable - but may have a go at a better mould. Will report back. Iain Link to comment Share on other sites More sharing options...
Nwanda Posted March 24, 2012 Share Posted March 24, 2012 This is THE best introductory post I have ever read. EVER. well done Lt Dayan and welcome! Absolutely the very best - and as with this inspired poster, I too am not getting any younger - the original posts on this build started when I rejoined the modelling world, and I am now 51 ...... Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 24, 2012 Author Share Posted March 24, 2012 (edited) I too am not getting any younger - the original posts on this build started when I rejoined the modelling world, and I am now 51 ...... Nag, nag, nag... And, yes, best intro post ever and really nice to have people with real experience of these beautiful aeroplanes looking in. Doesn't help with my guilt at such slow progress though All I will say is I haven't seen any others being built! <wanders outside with Connie and some sunshine - back later> Iain Edited March 24, 2012 by Iain (32SIG) Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 24, 2012 Author Share Posted March 24, 2012 Been casting engines - with mixed results... The shapes are complex and I'm not up and running yet with a pressure chamber - so a few air bubbles - and large voids on the upper surface in the mould as there's nowhere for trapped air to go. With hindsight it would have been easier to keep the Skyraider masters as separate halves and just poured halves at a time into open moulds. Still - after a bit of thunking I've decided to sand each moulded part to half thickness and join the resulting halves - and soort out the rocker covers later: Iain Link to comment Share on other sites More sharing options...
ursa_major Posted March 24, 2012 Share Posted March 24, 2012 Iain, something I've found useful for dislodging the air bubbles from the mould & also the resin is a cheap disposable electric toothbrush. I built a mount for one across the top of my mould box (gotta love Lego!) and leave it running for 35-40 mins after pouring the rubber. It's worked a treat so far on the 3 moulds I've used it on. For the resin pour, I set the brush running then inject the resin into the mould - it seems to be quite effective at shaking any bubbles left in the resin loose. I find that using a Monoject curved-tip syringe helps in cutting down on bubbles in the resin too. G. Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 24, 2012 Author Share Posted March 24, 2012 (edited) Now there's an idea... The rubber moulds are pretty good - it's getting the resin to flow the hard part - especially as the highest point on the cylinders (upper part of the mould) are above the point at which the resin enters. I've toyed with adding risers from these points (you should be able to see the voids in the castings in one of the pics) - but suspect it's too late now - although tempted to put that half of the mould in the freezer and try drilling). The 'bench' sander and two halves route looking most promising atm... Iain Edited March 24, 2012 by Iain (32SIG) Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 24, 2012 Author Share Posted March 24, 2012 Just had a cunning plan involving sharpened brass tube and a hammer - back shortly! Iain Link to comment Share on other sites More sharing options...
Iain Ogilvie Posted March 24, 2012 Author Share Posted March 24, 2012 OK - cunning plan - risers where I'm getting voids... Had a bit of cured rubber left in plastic pot from mould making and found I could get a neat hole made in the rubber using sharpened brass tube and a hammer (drills no good - they just tear and no neat hole). So - back to the mould: Other section done after this photo - and smaller rod used to puch down through the base mould from the rocker covers. Well - resin poured - we'll see: Iain Link to comment Share on other sites More sharing options...
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